code: def test_last(self):
      index = pd.date_range("2018-04-09", periods=4, freq="2D")
      pdf = pd.DataFrame([1, 2, 3, 4], index=index)
      psdf = ps.from_pandas(pdf)
      self.assert_eq(pdf.last("1D"), psdf.last("1D"))
      self.assert_eq(
          pdf.last(DateOffset(days=1)), psdf.last(DateOffset(days=1))
      )
      with self.assertRaisesRegex(
          TypeError, "'last' only supports a DatetimeIndex"
      ):
          ps.DataFrame([1, 2, 3, 4]).last("1D")
  
imports: import unittest
  import numpy
  import pandas
  from pandas.tseries.offsets import DateOffset
  from pyspark import pandas
  from pyspark.errors import PySparkValueError
  from pyspark.pandas.config import option_context
  from pyspark.testing.pandasutils import ComparisonTestBase
  from pyspark.testing.sqlutils import SQLTestUtils
label_desc: Use image node_id 10 for calling the FrameReindexingMixin obj's underlying member method code with example usage: obj.test_last() without return types